chore: import upstream snapshot with attribution

paddle/phi/kernels/sparse/cpu/matmul_grad_kernel.cc

@@ -0,0 +1,62 @@
+/* Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#include "paddle/phi/kernels/sparse/matmul_grad_kernel.h"
+
+#include "paddle/phi/backends/cpu/cpu_context.h"
+#include "paddle/phi/core/kernel_registry.h"
+
+namespace phi::sparse {
+
+// TODO(zhouwei25): implement CPU backward kernel of " CSR @ DENSE -> DENSE"
+template <typename T, typename Context>
+void MatmulCsrDenseGradKernel(const Context& dev_ctx UNUSED,
+                              const SparseCsrTensor& x UNUSED,
+                              const DenseTensor& y UNUSED,
+                              const DenseTensor& dout UNUSED,
+                              SparseCsrTensor* dx UNUSED,
+                              DenseTensor* dy UNUSED) {
+  PADDLE_THROW(common::errors::Unimplemented(
+      "Not support CPU backward kernel of 'sparse.matmul' now."));
+}
+
+// TODO(zhouwei25): implement CPU kernel of " DENSE @ DENSE * CSR_MASK -> CSR"
+template <typename T, typename Context>
+void MaskedMatmulCsrGradKernel(const Context& dev_ctx UNUSED,
+                               const DenseTensor& x UNUSED,
+                               const DenseTensor& y UNUSED,
+                               const SparseCsrTensor& dout UNUSED,
+                               DenseTensor* dx UNUSED,
+                               DenseTensor* dy UNUSED) {
+  PADDLE_THROW(common::errors::Unimplemented(
+      "Not support CPU backward kernel of 'sparse.masked_matmul' now."));
+}
+
+}  // namespace phi::sparse
+
+PD_REGISTER_KERNEL(matmul_csr_dense_grad,
+                   CPU,
+                   ALL_LAYOUT,
+                   phi::sparse::MatmulCsrDenseGradKernel,
+                   float,
+                   double) {
+  kernel->InputAt(0).SetDataLayout(phi::DataLayout::SPARSE_CSR);
+}
+
+PD_REGISTER_KERNEL(masked_matmul_csr_grad,
+                   CPU,
+                   ALL_LAYOUT,
+                   phi::sparse::MaskedMatmulCsrGradKernel,
+                   float,
+                   double) {}